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Seismic performance of prestressed concrete stand structure supporting retractable steel roof

Yiyi CHEN, Dazhao ZHANG, Weichen XUE, Wensheng LU

《结构与土木工程前沿（英文）》 2009年 第3卷 第2期   页码 117-124 doi: 10.1007/s11709-009-0024-3

摘要： The seismic behavior of a structural system composed of pre-stressed concrete stand supporting a retractable steel roof was studied, which is typically based on the prototype of engineering project of Shanghai Qizhong Tennis Center. By elasto-plastic finite element analysis and shaking table test, the following were investigated: the effects of roof configurations in opening and closing, the effect of pre-stress on the structural seismic response, and the failure mechanism of the spatial stand frame systems featured with circularly arranged columns and inverse-cone type stands. It was found that the roof status has great effect on the natural period, vibration modes, and seismic response of the whole structure, the stand response to horizontal seismic excitation is stronger in roof opening configuration than in closing state, and the response mode is dominantly translational rather than rotational, though the stand is characterized by its fundamentally torsional vibration mode. The study indicated that the pre-stressed inverse-cone stands can keep the system from global side-sway collapse under gravity loads, even in the case that most columns loose moment capacity.

关键词： retractable steel roof     prestressed concrete     seismic performance     failure mode     inelastic response     shaking table test    

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Collapse fragility assessment of steel roof framings with force limiting devices under transient wind

Linjia BAI, Yunfeng ZHANG

《结构与土木工程前沿（英文）》 2012年 第6卷 第3期   页码 199-209 doi: 10.1007/s11709-012-0168-4

摘要： Steel structural frame is a popular structural form to cover large-span roof space and under high winds. Either part of the roof enclosure or the entire roof structure can be lifted off a building, particularly for low sloped roofs subject to wind-induced suction force. Collapse of roof could cause severe economic loss and poses safety risk to residents in the building. The buckling of members in a steel roof frame structure, which may lead to progressive collapse, may be dynamic in nature. This paper presents a fragility analysis of the collapse of steel roof frame structures under combined static and transient wind loading. Uncertainties associated with wind load change rate and member imperfections are taken into account in this study. A numerical example based on a Steel Joist Institute (SJI) K series joist was used to demonstrate the use of force limiting devices for collapse risk mitigation. For the presented fragility assessment of steel roof collapse, a Monte Carlo method combined with response surface approach was adopted, which greatly reduces the computation time and makes the Monte Carlo simulation feasible for probabilistic collapse analysis of steel roof frame structures.

关键词： collapse     dynamic response     fragility analysis     Monte Carlo simulation     wind load    

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三峡升船机顶部机房钢屋架设计与施工

孙昌忠

《中国工程科学》 2013年 第15卷 第9期   页码 33-39

摘要：

根据三峡升船机顶部机房钢屋架的使用要求，研究分析了钢屋架的结构形式，通过建立三维有限元模型验证了钢屋架结构形式及其设计方案在施工阶段的结构安全性。同时，通过对钢屋架施工方案的研究，制定了适合三峡升船机顶部机房钢屋架施工作业环境的施工程序以及施工设备选型，对钢屋架施工过程中钢桁架分段、格构支撑架的设置、钢桁架吊装、中控室屋面网架安装、屋面板安装等环节提出了针对性的施工方法。三峡升船机顶部机房钢屋架所采用的结构设计方法与施工方案确保了钢屋架的顺利安装与安全运行，对类似工程具有一定的参考价值。

关键词： 升船机     机房     钢屋架     设计     施工     三峡工程    

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Effects of green roof damping and configuration on structural seismic response

《结构与土木工程前沿（英文）》   页码 1133-1144 doi: 10.1007/s11709-023-0959-9

摘要： Sustainable structures are critical for addressing global climate change. Hence, their structural resilience or ability to recover from natural events must be considered comprehensively. Green roofs are a widely used sustainable feature that improve the environment while providing excellent occupant amenity. To expand their usage, their inherent damping and layout sensitivity to seismic performance are investigated in this study. The soil of a green roof can serve as a damper to dissipate the energy generated by earthquakes or other dynamic events. Results of preliminary analysis show that a green roof soil can increase localized damping by 2.5% under both dry and saturated conditions. Based on these findings, nonlinear time-history analyses are conducted on a three-story building in SAP2000 to monitor the structural behavior with and without a green roof. The increased damping in the green roof soil is beneficial to the structural performance, i.e., it reduces the building displacement and acceleration by 10% and 12%, respectively. Additionally, certain configurations are more effective and beneficial to the structural response than others, which suggests the possibility of design optimization. Based on the findings of this study, new methods of modeling and considering green roofs in structural design are established.

关键词： green infrastructure     green roof     structural resilience     seismic design    

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Fragility assessment of wood sheathing panels and roof-to-wall connections subjected to wind loading

《结构与土木工程前沿（英文）》 2021年 第15卷 第4期   页码 867-876 doi: 10.1007/s11709-021-0745-5

摘要： The performance of the wood-frame buildings after tornadoes has shown that the majority of the wind damage resulted from building envelope failure most typically due to the loss of the roof. To assess the performance and the reliability of low-rise wood-frame residential buildings with a focus on the roofs, fragility analysis can be used to estimate the probability of failure of a roof when constructed with specified nails and sheathing sizes. Thus, this paper examines the fragility of specific types of nails, roof-to-wall (RW) connection details, and sheathing sizes based on the damaged roofs that were previously assessed in the Dunrobin area in Ottawa (Ontario) that was hit with an Enhanced Fujita (EF3) tornado on September 21, 2018. The presented fragility analysis considers four scenarios, including different sheathing and nail sizes. Dead loads, wind loads, and resistance on the sheathing panels were compiled and analyzed to determine the failure of the examined roofs. The eight fragility models suggest that the safest roof sheathing (RS) is the 1.22 m × 1.22 m sheathing panel with 8 d nails, and the safest RW connections is achieved by using H2.5 hurricane clips.

关键词： tornadoes     wind loads     low-rise buildings     fragility analysis     risk assessment     structural failures    

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Lifting installation and prestressed cable construction of suspendome roof for Wuhan Gymnasium

GUO Zhengxing, SHI Kairong, LUO Bin, TIAN Qiliang, WU Julong, BI Shuiyong

《结构与土木工程前沿（英文）》 2008年 第2卷 第1期   页码 87-92 doi: 10.1007/s11709-008-0005-y

摘要： The steel roof of Wuhan Gymnasium is a long-span suspendome structure system. According to the structural characteristics of the roof, the lifting installation of upper latticed shell and the installation and tension of lower prestressed cables are introduced in detail. The cable tension is completed successfully on June 27, 2006, while the test results of cable forces and structural deformation are comparatively consistent with the theoretical analysis results. Moreover, Strut-adjustment Method is innovated and applied successfully in the construction of long-span suspendome structure for the first time, and the theoretical and practical experiences can be used for the research and application of similar new-type spatial structures.

关键词： practical     new-type     installation     consistent     Gymnasium    

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Strength of tubular welded joints of roof trusses in Shanghai Qizhong Tennis Center

TONG Lewei, GU Min, CHEN Yiyi, ZHOU Liying, SUN Jiandong, CHEN Yangji, LIN Yingru, LIN Gao

《结构与土木工程前沿（英文）》 2008年 第2卷 第1期   页码 30-36 doi: 10.1007/s11709-008-0010-1

摘要： Static strength of multi-planar welded joints with seven brace members and one chord member made of circular hollow sections is investigated in the paper, based on the engineering practice of moveable roof trusses of Shanghai Qizhong Tennis Center. Firstly, comparative experiments were carried out on two model joints with a scale of 1:3. One joint was not reinforced, whereas the other was reinforced with ring stiffeners inside the chord member. Failure mode, stress distribution, plastic-zone development and ultimate load capacity of the joints were investigated, and effects of the ring stiffeners on the joint behavior were observed through the experiments. Secondly, finite element analysis of both the tested model joints was performed. The calculation results are in a good agreement with the experimental results, which indicated that the numerical analysis was quite effective. Finally, the strategy for enhancing strength of the complicated joint is discussed. Parameters study on the constructional details of ring stiffeners was carried out using FE method. The present research shows the multi-planar circular hollow section joint with high ratio of diameter to thickness of the chord and multiple braces is liable to chord plasticity under axial tension and compression on the braces. For the design of the joint, it is suggested that the ring stiffeners are installed insider the chord to meet needs of enough stiffness and strength. Both position and number of the stiffeners should be carefully determined based on the axial forces on the braces and their diameters. The stiffener thickness should not be less than the chord thickness, and the diameter of the hole at the center of the stiffener should not be greater than half of the chord diameter.

关键词： diameter     numerical analysis     calculation     thickness     engineering    

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浅埋大跨黄土隧道管棚受力机制分析

李健,谭忠盛,喻渝,倪鲁肃

《中国工程科学》 2011年 第13卷 第9期   页码 92-96

摘要：

以郑西客运专线阌乡隧道为依托工程，进行浅埋大跨黄土隧道长大管棚受力机制的研究。对隧道进入下穿高速公路前的管棚纵向变形进行现场监测，根据测试结果分析管棚在隧道开挖过程中的受力特性，得到浅埋黄土隧道长大管棚受力变形规律：掌子面前方约15 m处管棚开始受力，掌子面过后约15 m管棚的受力趋于稳定，管棚的纵向变形总体上呈凹槽形分布，掌子面处管棚受力最大。通过有限差分程序FLAC3D计算不同管棚参数条件下的施工方案，为隧道下穿段管棚工法及施工方案的优化设计提供理论依据，并在下穿段沉降监测中得到验证。

关键词： 浅埋暗挖     下穿施工     黄土隧道     管棚     变形监测     受力机制    

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我国综采放顶煤开采技术及其展望

赵经彻

《中国工程科学》 2001年 第3卷 第4期   页码 9-16

摘要：

介绍了20世纪80年代中期以来对我国煤炭工业有重大影响的综采放顶煤开采技术的概况；论述了我国科技人员在该项技术进步中在顶煤可放性评价、岩（煤）运动规律及支架围岩关系、提高回收率的技术和工艺、安全控制、大功率成套设备研制等方面的创造性贡献；对综采放顶煤技术的发展趋势作出了评价。

关键词： 煤炭开采     综采放顶煤     顶板管理     资源回收率     煤矿安全    

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浅埋深两硬条件下特厚煤层综放开采技术

张忠温,吴吉南

《中国工程科学》 2011年 第13卷 第11期   页码 107-112

摘要：

针对平朔矿区4号煤层条件，采用理论分析方法研究了浅埋深两硬条件下4号煤层顶煤的冒放性及合理采煤方法。以提高顶煤冒放性为目标，采用数值模拟的方法进行了综放工作面参数及设备选型配套研究。实践表明，浅埋深两硬煤层条件下通过加大综放工作面长度与割煤高度，可以实现安全、高效、高回收率开采。

关键词： 浅埋深     两硬煤层     顶煤冒放性     大采高综放    

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中国钢桥

潘际炎

《中国工程科学》 2007年 第9卷 第7期   页码 18-26

摘要：

介绍了我国钢桥的发展及国内外的钢桥比较；论述了建造钢桥的钢材及其要求的化学成分和物理力学性能。

关键词： 中国钢桥     钢材     钢桥设计     钢桥结构    

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On braced trapezoidal corrugated steel shear panels: An experimental and numerical study

《结构与土木工程前沿（英文）》 2023年 第17卷 第3期   页码 396-410 doi: 10.1007/s11709-023-0934-5

摘要： In this study, a new system consisting of a combination of braces and steel infill panels called the braced corrugated steel shear panel (BCSSP) is presented. To obtain the hysteretic behavior of the proposed system, the quasi-static cyclic performances of two experimental specimens were first evaluated. The finite element modeling method was then verified based on the obtained experimental results. Additional numerical evaluations were carried out to investigate the effects of different parameters on the system. Subsequently, a relationship was established to estimate the buckling shear strength of the system without considering residual stresses. The results obtained from the parametric study indicate that the corrugated steel shear panel (CSSP) with the specifications of a = 30 mm, t = 2 mm, and θ = 90° had the highest energy dissipation capacity and ultimate strength while the CSSP with the specifications of a = 30 mm, t = 2 mm, and θ = 30° had the highest initial stiffness. It can thus be concluded that the latter CSSP has the best structural performance and that increasing the number of corrugations, corrugation angle, and plate thickness and decreasing the sub-panel width generally enhance the performance of CSSPs in terms of the stability of their hysteretic behaviors.

关键词： trapezoidal corrugated plate     steel shear panel     braced steel shear panel     experimental study     buckling resistance.    

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宝钢纯净钢生产技术的进步

崔健,郑贻裕,朱立新

《中国工程科学》 2005年 第7卷 第6期   页码 21-26

摘要：

论述了钢中碳、氮、氧、磷、硫以及夹杂物控制方面的技术进步，讨论了IF钢、管线钢所达到的纯净度纵使水平。

关键词： 宝钢     纯净钢     IF钢     管线钢     炼钢    

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Causations of failure in megaprojects: A case study of the Ajaokuta Steel Plant project

Oluwole Alfred OLATUNJI

《工程管理前沿（英文）》 2018年 第5卷 第3期   页码 334-346 doi: 10.15302/J-FEM-2018011

摘要：

This paper uses project organizational theories to draw lessons from a historic megaproject, the Ajaokuta Steel Plant (ASP). Archival reports on the ASP were explored to identify the unique attributes of the project; the political wrangling that underplayed its evolution, its economic significance and organizational impacts. Findings suggest the goals of the ASP project were, and still are, unambiguous. Failure occurred as socio-political forces aggravated the project’s complex milestones. Stakeholders were impatient with pre-project investigations. During planning, owners ignored opinions that were contrary to their expectations. While delays lingered, pressures from the global economy weakened the project’s motivation to succeed. These combined to turn the project’s outcomes into a chaotic situation that triggered dire implications. Despite about 1400% overrun in cost, the success achieved on the plant was 28% at commissioning. Contractors remained on site until eight years after commissioning. Six key elements of the 482 items in the ASP project contract were not delivered nearly 40 years on. A simplistic look at these suggests poor planning is the main problem. However, planning issues is not entirely strange in greenfield projects. The paper draws strength from project organization theories to explain what was poor about the planning. Socrates’ generic management theory was used to explain the role of leadership in the failure of the ASP project. McGregor’s Theory X and Theory Y explain the significance of stakeholders’ integration in megaprojects. Systems and chaos theories were used to explain the sensitivity of the ASP project to uncertainties. Narratives on these combine well to inspire stakeholders of megaprojects on where and how to seek courage in making effective plans that can help achieve success in complex projects. While normative literature only recognizes project success in a definitive perspective, this study provides insights from failure as an instrument to trigger sublime reflections.

关键词： industrial projects     megaprojects     Nigeria     project organizational theories     steel plant    

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Parametric study of hexagonal castellated beams in post-tensioned self-centering steel connections

Hassan ABEDI SARVESTANI

《结构与土木工程前沿（英文）》 2019年 第13卷 第5期   页码 1020-1035 doi: 10.1007/s11709-019-0534-6

摘要： The effects of important parameters (beam reinforcing plates, initial post-tensioning, and material properties of steel angles) on the behavior of hexagonal castellated beams in post-tensioned self-centering (PTSC) connections undergone cyclic loading up to 4% lateral drift have been investigated by finite element (FE) analysis using ABAQUS. The PTSC connection is comprised of bolted top and bottom angles as energy dissipaters and steel strands to provide self-centering capacity. The FE analysis has also been validated against the experimental test. The new formulations derived from analytical method has been proposed to predict bending moment of PTSC connections. The web-post buckling in hexagonal castellated beams has been identified as the dominant failure mode when excessive initial post-tensioning force is applied to reach greater bending moment resistance, so it is required to limit the highest initial post-tensioning force to prevent this failure. Furthermore, properties of steel material has been simulated using bilinear elastoplastic modeling with 1.5% strain-hardening which has perfectly matched with the real material of steel angles. It is recommended to avoid using steel angles with high yielding strength since they lead to the yielding of bolt shank. The necessity of reinforcing plates to prevent beam flange from local buckling has been reaffirmed.

关键词： finite element analysis     hexagonal castellated beam     parametric study     post-tensioned self-centering steel connection     steel moment-resisting frame    

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标题 作者 时间 类型 操作

Seismic performance of prestressed concrete stand structure supporting retractable steel roof

Yiyi CHEN, Dazhao ZHANG, Weichen XUE, Wensheng LU

期刊论文

Collapse fragility assessment of steel roof framings with force limiting devices under transient wind

Linjia BAI, Yunfeng ZHANG

期刊论文

三峡升船机顶部机房钢屋架设计与施工

孙昌忠

期刊论文

Effects of green roof damping and configuration on structural seismic response

期刊论文

Fragility assessment of wood sheathing panels and roof-to-wall connections subjected to wind loading

期刊论文

Lifting installation and prestressed cable construction of suspendome roof for Wuhan Gymnasium

GUO Zhengxing, SHI Kairong, LUO Bin, TIAN Qiliang, WU Julong, BI Shuiyong

期刊论文

Strength of tubular welded joints of roof trusses in Shanghai Qizhong Tennis Center

TONG Lewei, GU Min, CHEN Yiyi, ZHOU Liying, SUN Jiandong, CHEN Yangji, LIN Yingru, LIN Gao

期刊论文

浅埋大跨黄土隧道管棚受力机制分析

李健,谭忠盛,喻渝,倪鲁肃

期刊论文

我国综采放顶煤开采技术及其展望

赵经彻

期刊论文

浅埋深两硬条件下特厚煤层综放开采技术

张忠温,吴吉南

期刊论文

中国钢桥

潘际炎

期刊论文

On braced trapezoidal corrugated steel shear panels: An experimental and numerical study

期刊论文

宝钢纯净钢生产技术的进步

崔健,郑贻裕,朱立新

期刊论文

Causations of failure in megaprojects: A case study of the Ajaokuta Steel Plant project

Oluwole Alfred OLATUNJI

期刊论文

Parametric study of hexagonal castellated beams in post-tensioned self-centering steel connections

Hassan ABEDI SARVESTANI

期刊论文